(19)

(11)

EP 0 400 020 A1

(12)

(43) Date of publication: 05.12.1990 Bulletin 1990/49 (21) Application number: 89901144.0 (22) Date of filing: 29.12.1988

(51) International Patent Classification (IPC):  B01D 29/ 03( . ) D21D 5/ 16( . ) (86) International application number: PCT/SE1988/000710 (87) International publication number: WO 1989/006719 (27.07.1989 Gazette 1989/16)

(84) Designated Contracting States: DE FR GB (30) Priority: 15.01.1988 SE 19880000114 (71) Applicant: AKTIEBOLAGET KNUTSILPLATAR S-467 00 Grästorp (SE)	(72) Inventor: GRUNDSTRÖM, Karl, Johan S-752 57 Uppsala (SE) (74) Representative: Sundqvist, Hans  Sunds Defibrator Industries Aktiebolag Patents Dept. Strandbergsgatan 61 S-112 51 Stockholm S-112 51 Stockholm (SE)